MSFT calendar call spread: selling time twice
Institutional-quality chain with a well-behaved vol surface — low-20s IV outside of earnings, a modest dividend, and enough open interest at round strikes that spreads fill near mid.
A calendar sells the Aug 28 $465 call and buys the same strike Sep 18 — $503 debit on MSFT at $464.72. You are not betting on direction; you are betting that the 27-day option decays faster than the 48-day one you own, which it does, as long as MSFT stays near $465.
The trade, priced from the chain
27d to August 28, 2026| Leg | Qty | Price | Δ | IV | Cash |
|---|---|---|---|---|---|
| SellAug 28 $465 call | 1 | $16.20 | 0.50 | 34% | +$1,620 |
| BuySep 18 $465 call | 1 | $21.23 | 0.51 | 33% | −$2,123 |
Every leg above is priced at the chain’s own quote — the identical number the builder will show you when you click through (last traded price), captured August 1, 2026 with a 15-minute delay. Only strikes whose print survives an implied-volatility check (within 20% of its own IV) and a no-arbitrage check across the ladder are priced here. Full methodology. Greeks, breakevens, max profit/loss and probability of profit are computed by OptionTracker’s engine at r = 4.2%. Educational analysis, not investment advice.
How a calendar call spread works
Same strike, two expiries. The short Aug 28 call decays on a steep curve; the long Sep 18 call decays on a shallow one. The difference between those two decay rates is the entire profit engine — which is why the position wants the stock to sit still.
Max profit occurs with MSFT pinned at $465 on August 28, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $1,011 against the $503 debit, which is also the maximum loss.
Calendars are LONG vega, unlike most short-premium trades. The back month has more vega than the front, so rising implied vol helps you. At 31% ATM on the front expiry, MSFT is the 15th richest of the 20 underlyings on this site — calendars are best opened when front-month vol is rich relative to the back.
Because the legs expire on different dates, there is no single expiry payoff: the numbers on this page are marked to model at the near expiry (August 28, 2026) using each leg's own implied vol — the same convention the builder uses.
When it makes sense
- Front-month IV is elevated relative to the back month (a flat or inverted term structure). You are selling the expensive expiry and buying the cheap one.
- You want a defined-risk long-vega position. Max loss is the $503 debit.
- You want to own the back-month call eventually and would rather be paid to wait for it.
- The position is small enough that a total loss is uninteresting, because long-vol structures reach zero on a regular schedule.
Where the risk actually is
Early assignment on the short call — particularly near an ex-dividend date (MSFT goes ex on August 20, 2026) — leaves you short 100 shares against a long back-month call. Manageable, but it turns a quiet position into a margin conversation.
Vol term structure can move against you: if back-month IV falls while front-month holds, the position loses on vega even with the stock exactly where you wanted it.
The decay is relentless and it is front-loaded against you in exactly the window most retail traders hold. A long-vol position with no exit plan is a slow, fully-predictable loss.
What is different about doing this on MSFT
Between earnings, Microsoft is the quietest large-cap on this list and the straddle prices accordingly — cheap in absolute vol points, and still usually too expensive relative to what the stock does. The vol trade here is the earnings term structure, not the level.
MSFT's Aug 28 strikes are $5 apart near the money (1.08% of spot). That is workable, but it means a one-rung move in a strike is a real change in the trade, not a tweak. 32k contracts of open interest on Aug 28 is workable around the money and thin in the wings — width costs more here than the ladder suggests. 25 strikes on that expiry — 35% of the board — carry prints that agree with their own implied volatility and hold up across the ladder, and those are the strikes priced here. Tight at every listed strike; round-number strikes carry the open interest and the best fills.
Skew is inverted: the 25-delta CALL implies 1.8% more vol than the put. That is the market pricing upside risk above downside risk — a squeeze, a takeover rumour, or a crowded short. Owning upside on an inverted skew means paying the expensive side of the surface, which is worth knowing before you buy the call. The term structure is flat inside 1.5% between the two captured expiries, so there is no calendar edge to harvest and no event visibly priced into one month over the other.
At 31% ATM implied vol, the Aug 28 options are pricing a one-standard-deviation move of $38.59 over 27 days — roughly −8.3% to +8.3%, or $426.13 to $503.31. The implied move is the market's bid for the exact thing this structure is long. Buying it at fair value and hoping is not a strategy.
What actually goes wrong here, as opposed to in general: Assuming a quiet chart means quiet options. Microsoft's earnings gaps have repeatedly cleared the implied move while the between-print tape stayed asleep.
Picking the strike on MSFT
The strike is your forecast for where MSFT sits on August 28, 2026, and the expiry gap sets how much time you're buying:
| Band | What it means | When it fits |
|---|---|---|
| ATM strike | Maximum time-decay differential | The neutral construction, quoted above at $465. |
| OTM call strike | A directional lean upward | Cheaper, profits if the stock drifts toward the strike by the near expiry. |
| Narrow expiry gap | Front and back close together | Smaller debit, smaller edge. Decay differential needs room to work. |
| Wide expiry gap | 27d vs 48d here | More vega, more debit, more exposure to term-structure moves. |
The chain below shows the Aug 28 calls. Compare the ATM IV there with the back month: if the front is not richer, the calendar's core edge is missing.
From the far strike to the near one, the premium below moves by a factor of 4.0. Where you sit on that curve is the trade. Open interest concentrates at $470 on this expiry, which is usually where the fills are cleanest.
| Strike | vs spot | Mid | Δ | IV | % of spot | Ann. | OI |
|---|---|---|---|---|---|---|---|
| $445 | −4.2% | $27.00 | 0.67 | 38% | 5.8% | 79% | 295 |
| $450 | −3.2% | $25.50 | 0.63 | 36% | 5.5% | 74% | 839 |
| $455 | −2.1% | $21.70 | 0.59 | 36% | 4.7% | 63% | 504 |
| $460 | −1.0% | $18.68 | 0.54 | 34% | 4.0% | 54% | 586 |
| $465used | +0.1% | $16.20 | 0.50 | 34% | 3.5% | 47% | 880 |
| $470 | +1.1% | $13.40 | 0.45 | 33% | 2.9% | 39% | 881 |
| $475 | +2.2% | $11.15 | 0.40 | 33% | 2.4% | 32% | 503 |
| $480 | +3.3% | $9.00 | 0.35 | 32% | 1.9% | 26% | 583 |
| $485 | +4.4% | $6.70 | 0.30 | 31% | 1.4% | 19% | 518 |
MSFT calls expiring August 28, 2026· 15-min delayed capture · “Ann.” annualizes the mid as a percentage of spot over 27 days.
Managing the position
- Close at 25–50% of the debit in profit. Calendars rarely reach theoretical max profit because that requires a pin.
- Watch the short leg through ex-dividend dates and the last week — assignment there is the most common way a calendar breaks.
- Have a vega target as well as a price target. If the position is up because implied vol rose and the stock has not moved, that is the trade working — take it.
- Roll the long leg out when the thesis is intact and the clock is not. Buying more time is usually cheaper than buying a new position at a worse implied vol.
Common mistakes
Treating it as a short-vol trade
Calendars are long vega. A vol crush after quarterly earnings and Azure growth guidance; a quiet name between prints hurts the back month more than it helps the front — the opposite of what most people expect from a "premium selling" structure.
Forgetting the legs expire separately
On August 28, 2026 you still own a Sep 18 call. That is a position, and it needs a plan of its own.
Ignoring the back month's calendar
A calendar spread quietly owns whatever lands in the back expiry. Check what is scheduled there before assuming you are only short the front.
MSFT calendar call spread FAQ
How does a MSFT calendar call spread make money?
From the difference in decay rates. The Aug 28 call you sold loses value faster than the Sep 18 call you own, so if MSFT sits near $465 the spread widens. Peak value at the near expiry is about $1,011 against a $503 debit.
Why does this page show a modelled payoff instead of an expiry payoff?
Because the legs expire on different dates — August 28, 2026 and the Sep 18 expiry. The engine marks the position to model at the near expiry using each leg's own implied vol, which is the only honest way to draw a calendar's P/L.
Should I use the Aug 28 or the Sep 18 expiry on MSFT?
The two captured expiries imply nearly the same volatility, so there is no calendar edge to pick up — choose the expiry on the thesis and the time you need, not on the surface.
How wide are MSFT option strikes?
About $5 apart near the money on the Aug 28 expiry — 1.08% of the share price per rung. That sets how precisely you can place a short strike, and how granular a spread's width can be.
Build it yourself
Everything above is one construction at one moment. Open it in the builder to drag strikes along the ladder, scrub the expiry, and watch max profit, breakevens and probability of profit recompute live against the real MSFT chain — free, no account.
Related reading
- Strike selection with delta and IV"Sell the 30 delta" is the most repeated rule in retail options and nobody can tell you what it means. Here is what delta actually measures, where it stops matching probability, and how far off it gets on a high-IV name.
- Covered calls on shares you already ownThe covered-call math you find online divides premium by cost basis. If you bought the stock years ago, that number is a fantasy — and it will talk you into selling a strike you should never have touched.
- The wheel strategy, with real numbersEveryone can recite the four steps. Almost nobody can tell you what a completed cycle returned on the capital it tied up. Here is one, priced off a real chain and folded by the same engine that runs our tracker.
Other MSFT strategies
- MSFT covered callSell upside on shares you already own and get paid for the cap.
- MSFT cash-secured putGet paid to place a limit order below the market.
- MSFT iron condorSell a range, buy the wings, collect if the stock stays put.
- MSFT bull call spreadBuy a call, sell a higher one — cheaper upside with a ceiling.
- MSFT bull put spreadSell a put spread below the market: credit now, defined risk.
- MSFT long straddleBuy the call and the put — pay for a move in either direction.
- MSFT long strangleOTM call plus OTM put — cheaper than a straddle, needs more move.
- MSFT long callDefined-risk upside with a deadline attached.
- MSFT long putDefined-risk downside, or insurance with an expiry date.
Calendar Call Spread on other tickers
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- COIN calendar call spread
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